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Introduction
Additional affiliations
August 2008 - January 2021
October 2004 - August 2008
Laboratoire Central des Ponts et Chaussées
Position
- Professor (Associate)
October 2002 - September 2003
Publications
Publications (88)
This paper assesses the performance of an embankment constructed in 2010 with a stabilised expansive soil. Two types of treatment were employed at construction time: 4% lime and a mix of 2% lime and 3% cement. A sampling campaign was carried out in 2021 to evaluate the long-term performance of the stabilised soil properties. To assess the compressi...
This paper assesses the performance of an embankment constructed in 2010 with a stabilised expansive soil. Two types of treatment were employed at construction time: 4% lime and a mix of 2% lime and 3% cement. A sampling campaign was carried out in 2021 to evaluate the long-term performance of the stabilised soil properties. To assess the compressi...
The mechanical efficiency of soil stabilization with cement is mainly controlled by various parameters, namely, the amount of binder, the compaction soil state and the curing conditions. The strength of the treated soil is the result of a complex combination of several factors that condition the physicochemical processes involved in cement hydratio...
An experimental investigation on the durability of Lightweight Cemented Soils (LWCS) after wetting and drying cycles was developed, focusing on the evolution of their mechanical response. Wetting and drying cycles were performed in climatic chamber to test their mechanical performance as function of number of cycles and the environmental conditions...
In energy geostructures, the long-term shaft resistance is affected by cyclic thermo-mechanical loads associated with structural loads and cyclic thermal solicitations. This study aims to investigate the effect of monotonic and cyclic thermal loads on normally consolidated (NC) and overconsolidated (OC) kaolin clay–rough steel interface. The peak s...
The core objective of this study is to analyse the impact of the wetting/drying protocol on the mechanical behaviour of a cement-treated sand. The impact of two types of wetting and drying cycles of different magnitudes was evaluated with a quantitative approach based on the stress-dilatancy approach. The main effect of the wetting/drying cycles is...
In the context of the French Cigéo-project, a mixture composed of 70% processed Callovo-Oxfordian claystone spoil and 30% MX80-bentonite could be a potential backfill material, whose installation aims to stabilize the surrounding rock formation and to limit the propagation of the excavation damaged zone. The backfill material must sustain the overb...
In energy geostructures, the soil-structure interface is subjected to thermo-mechanical loads. In this study, a non-isothermal soil-structure interface model based on critical state theory is developed from a granular soil-structure interface constitutive model under isothermal conditions. The model is capable of capturing the effect of temperature...
The soil stabilisation is employed to construct geostructures as embankments, river levees, road subbases or to backfill excavations, improving the mechanical behaviour and reducing the consumption of extracted primary aggregates. This study is focused on the use of lime/cement treated soils to backfill trenches where high power line cables are bur...
In energy geostructures, which exploit the heat in soil using earth contact elements, the interface is subjected to cyclic thermo-mechanical loads. Monotonic and cyclic constant-volume equivalent-undrained (CVEU) direct shear tests were performed on clay-clay and clay-structure interface at different temperatures (22 and 60 °C). Different cyclic an...
This study intends to examine the impact of successive wetting and drying cycles on the strength and hydraulic conductivity of lime- and cement-treated soil, with a special emphasis on the protocol that is employed to impose the cycles. Compacted specimens were cured for 90 days before being exposed to different numbers of wetting and drying cycles...
The shaft capacity of foundations highly depends on the monotonic and cyclic loads applied to the soil–structure interface. In energy geostructures that exploit the heat of soil using earth-contact elements, the interface is subject to cyclic thermomechanical loads. Monotonic and cyclic constant-volume equivalent-undrained (CVEU) direct shear tests...
The determination of the shear strength of coarse-grained soils in standard shear devices is a challenging task due to the presence of large grains. Three approaches could be used to reduce the grain size of the tested specimen. This study aimed to determine whether the shear strength of a coarse-grained soil with fines (particles smaller than 0.08...
The positive effects of lime or cement treatment could be altered by weathering in the very long term. In this context, the main purpose of this study is to examine the impact of wetting/drying cycles on the strength and the hydraulic conductivity of a compacted soil treated with lime and cement. Compacted specimens were cured for 90 days before be...
In soil stabilisation, the use of alternative products to lime or cement has been proposed. However, the effects of these additives, of various origins, on soil behaviour and stabilizing mechanisms are not well understood. Thus, the aim of this paper is to characterize the modification of the mechanical behaviour and microstructure of two soils aft...
This laboratory experimental program investigated the impact of variations in the expansive mineral content, the grain size distribution of employed bentonite, the initial dry density and the selected hydration path on the water retention characteristics and swelling properties of processed Callovo-Oxfordian claystone and its mixtures with MX80 ben...
In the present paper an experimental investigation on water retention properties of lightweight cemented soils (LWCS) taking into account the effects of air foam content and curing time is presented. This experimental study, aimed at determining the suction range corresponding to significant changes in water content, is preliminary to future invest...
L’objectif de cet article est de montrer comment l’analyse de la microstructure d’un sol gonflant peut contribuer à comprendre et expliquer certains traits de son comportement macroscopique. L’article s’appuie des études réalisées sur un sol gonflant traité à la chaux, ce traitement permettant de réduire le potentiel de gonflement et de diminuer la...
The determination of the mechanical properties of soils containing particles larger than the allowable size by standard laboratory equipment is problematic. It is indeed necessary to eliminate the coarsest fraction to carry out the tests, which poses a problem of representativeness of the results at the scale of the structure. Parallel gradation an...
The determination of the mechanical properties of soils containing particles larger than the allowable size of standard laboratory equipments is complex. It is indeed necessary to remove the coarsest fraction to carry out the tests. This scalping poses a problem of reliability of the results at the scale of the structure. Parallel gradation is the...
Mixtures composed of 70% crushed Callovo-Oxfordian claystone and 30% MX80-bentonite are considered as materials, that could be used for backfilling a future radioactive waste repository in deep sedimentary rock formations. Their characterization is of interest, as the replacement of fractions of crushed claystone by bentonite enhances the chemo-hyd...
The mechanical behaviour of the soil-structure interface plays a major role in the shear characteristics and bearing capacity of foundations. In thermo-active structures, due to non-isothermal conditions, the interface behaviour becomes more complex. The objective of this study is to investigate the effects of temperature variations on the mechanic...
The determination of the mechanical properties of soils containing particles larger than the allowable size of standard laboratory equipments is complex. It is indeed necessary to remove the coarsest fraction to carry out the tests. This scalping poses a problem of reliability of the results at the scale of the structure. Parallel gradation is the...
Construction of any type of structure on clayey ground could be problematic due to the high swelling potential and/or low strength characteristics of the soil. This can lead to low stability or differential settlement of the ground. Many soil stabilization techniques have been proposed to prevent the uneven settlement and failure of the soil. Stabi...
Mechanical behaviour of the soil–structure interface plays a major role in the shear characteristics and bearing capacity of foundations. In thermoactive structures, due to nonisothermal conditions, the interface behaviour becomes more complex. The objective of this study is to investigate the effects of temperature variations on the mechanical beh...
The compacted clay barrier of shallow depth repositories for wastes would be subjected to temperature variations. Consequently, the hydro-mechanical properties of compacted clays could be progressively modified, and thus affect the performance of repositories. The influence of effective stress and temperature on the creep behavior of a saturated co...
The influence of wet-dry cycles on the enduring performance (loss of mass, strength, and stiffness) of compacted fine-grained soils-portland cement blends might be important information for designing earthworks that could be subjected to severe climate conditions. This study assesses possible variations of cement-treated fine-grained soils' accumul...
L’objectif principal de ce travail est d’étudier l’impact des traitements au ciment, à la chaux ou avec des argiles, des sols compactés sur leurs caractéristiques d’érosion interne. Un nouveau dispositif d’étude de l’érosion interne modifié et amélioré a été conçu pour quantifier les effets de différents traitements sur l’évolution de la résistance...
Clayey soils could be exposed to thermal cycles in some engineering applications such as geothermal piles and nuclear waste storages. These temperature changes could affect the consolidation behaviour of these soils. In this context, this paper investigates the impact of temperature on the consolidation behaviour of saturated compacted clays. A tem...
Purpose
Sustainable development principles are leading earthwork companies to use all-natural materials extracted from the construction site to build the infrastructure. Natural materials with low characteristics must be improved. For dry soils, the common solution is to increase the compaction energy or add important quantities of water to reach t...
The aim of this paper is to study the impact of certain soil treatments on the internal erosion characteristics of treated compacted silt. The experiments measured the internal erosion using the hole erosion test (HET). This study aims to describe the effects of clay, lime and cement soil treatments on the internal erosion, specifically with regard...
The effect of lime on the yield stress, and more generally the presence of structure in the soil, is usually not accounted for in the design of geotechnical structures. As a result the potential of lime treatment or of a structured soil has not been fully exploited. This paper presents a new formulation to account for the effect of structure on the...
The aim of this study was to characterise the technical and environmental implications of non-traditional treatments of a low-plasticity compacted silt (PI = 14) and to investigate their actions both at the micro- and macro-structural scales. Three non-traditional additives derived from industrial vegetal by-products were studied. These additives a...
Lime treatment is a widely used technique in civil engineering practice to improve the mechan-ical properties of materials unsuitable for geotechnical structures. However, the effect of lime on the yield stress is usually not accounted for in the design of geotechnical structures. As a result the potential of lime treat-ment has not been fully expl...
The use of structured materials by engineering companies has become more and more frequent. Whether materials are naturally structured or artificially structured with a lime treatment, the effects of the structure on the yield stress are usually not accounted for in the design of geotechnical structures. This is due to the fact that the degradation...
The positive effects of lime treatment are likely to be altered by weathering, and the sustainability of lime-treatment positive effects is in question. In this study, the effects of successive drying/wetting cycles on the hydromechanical properties of a lime-treated clayey soil are assessed. Osmotic suction-controlled oedometers were used to deter...
Sustainable development principles lead earthworks companies to use all natural extracted materials on the construction site. Most of the time, these materials have to be improved, lime and cement being the traditional additives. In this context, the use of organic by products from various industries has been proposed. But the effects of these non-...
This paper deals with the recent research results obtained through SOTREDI research project, "SOil TREatment for DIkes" undertaken by the Lhoist Group, a lime producer, in collaboration with several research centers and universities. Lime-treatment of soils is a process that improves the workability of clayey materials and imparts them strong mecha...
The main purpose of this study is to examine both at micro-and macro scales the effects of wetting / drying on swelling / shrinkage behaviour of a com-pacted expansive clayey soil treated with lime. The results showed that lime treatment was efficient to prevent the swelling, but the shrinkage remained un-changed, regardless of the added lime conte...
The main purpose of this paper is to examine the impact of a wetting and drying path on the swelling/shrinkage of a compacted lime-treated expansive clayey soil both at the macro- and micro-scales. At the macro-scale, the soil water characteristic curves (SWRCs) of the compacted lime-treated materials (0%, 2% and 5% of lime content) were determined...
Soil treatment with lime is a well-known technique for earthworks, widely used in the building of embankments, capping layers, platforms… However, and even if some successful applications can be found in particular in the USA and Australia, lime-treated materials are barely used for hydraulic structures, in part because of the received belief that...
This paper describes the SOTREDI project, "Soil TREatment for Dikes", undertaken by Lhoist Group, a lime producer, since 2005. This project was led in partnership with research centres and universities, and presents some potential applications. The objective was to demonstrate that soil treatment with lime, besides enhancing the materials workabili...
Under a given compaction energy and procedure, it is known that maximum dry density of a soil is lowered due to lime addition. This modification of maximum dry density could alter the hydraulic conductivity of the soil. The main object of this study was to assess the impact of lime-stabilization on a silt soil microstructure and then on saturated h...
Despite the scant quantitative data available in the literature, it has been hypothesized that some chemical compounds can have deleterious effects on soil stabilization with lime and cements (e.g., nitrates, phosphates and chlorides). This study intends to assess their influence on soil stabilization quantitatively. An original experimental proced...
The durability of the mechanical improvements brought by lime once the involved earth structures are exposed to long-term hydraulic conditions (long-term water contact and water circulation) is still under discussion. This paper aims at assessing i) the impact of such hydraulic conditions on the mechanical shear strength of a lime-treated silty soi...
The main objective of the paper is to present a study on compacted expansive soil strains generated by complex hydric or mechanical loadings and their consequences on tested soil compressibility. In the first part of the paper, the suction-controlled testing devices are described (osmotic and salt solution methods). All the presented tests were per...
In the French concept of deep nuclear waste repositories, the galleries should be backfilled with excavated argillite after the site has been filled. Some additives like lime could be used to improve the mechanical characteristics of the argillite. After thousands of years, the degradation of the concrete lining of the galleries will generate an al...
In the French concept of deep nuclear wastes repository, the galleries should be backfilled with excavated argillite after the site exploitation period. After several thousands of years, the degradation of the concrete lining of the galleries will generate alkaline fluid (pH > 12) that will diffuse through the backfill. The objective of the paper i...
The long-term performance of lime-treated soil is still in question, especially in the case of the use of such soils to build earthen structures in permanent contact with water (i.e., dams, river levees, etc.) Indeed, water circulation may induce significant alteration of the improvements brought by the lime treatment. In this context, the main obj...
In the French model of deep nuclear wastes repositories, the galleries should be backfilled with excavated argillite after the site has been filled. After thousands of years, the degradation of the concrete lining of the galleries will generate an alkaline solute (pH > 12) that would circulate through the backfill. The goal of this paper is to desc...
A study was undertaken in order to characterise the effects of several potential deleterious compounds on soil stabilisation. An original procedure was used: a silty soil was mixed with each compound at a given concentration. The suitability of the different mixtures was then determined by tests according to French standards: volumetric swelling, t...
The influence of lime addition on the hydraulic conductivity of soils is still an open question. There is no general agreement in the literature whether it consistently induces a strong increase of the hydraulic conductivity of soils or not. In this context, the paper presents some results to give insights into this question. The effects of water c...
Lime addition is a widely used technique to improve the engineering behaviour of soils and is known to reduce the swelling potential of expansive soils. However, in the long term, the permanence of the effect is questionable. This question is of interest since lime might be used to prevent swelling of expansive soils in earthworks. An experimental...
In the French concept of deep nuclear wastes repository, the galleries should be backfilled with excavated argillite after the site exploitation period. After several thousands of years, the degradation of the concrete lining of the galleries will generate alkaline solute (pH > 12) that will diffuse through the backfill. The object of the paper is...
This paper presents the mathematical modelling of the modification of the pore space geometry of a structured soil subjected
to suction increase. Structured soil concepts are first introduced considering different fabric units, such as aggregates
and fissures. The numerical modelling of the structural evolution is based on experimental test results...
The swelling properties of a bentonite MX-80 and a Na montmorillonite obtained from MX-80 purification were analyzed as a function of relative humidity in free and constrained conditions. Gravimetric and XRD techniques were used to study the hydration of powder and compacted pellets in non confined conditions whereas hydration under constrained con...
A study of the hydromechanical behaviour of a compacted swelling material in the range of suctions comprised between 0 and 40 MPa was performed. This study has required the development of two kinds of suction controlled oedometer devices based on two different suction control techniques. In the range of suctions higher than 8.5 MPa, the saturated s...
The main goal of this paper is to present the first results of a study performed to provide insights into the relationship
between the hydromechanical stress path experienced by a compacted soil and the modification of its pore space geometry. A
new oedometer employing the axis translation technique was used to characterize the hydromechanical beha...
The paper presents a study of the hydromechanical behavior of a compacted swelling soil in a range of suctions comprised between 0 and around 300 MPa. To perform this study, two kinds of suction controlled oedometers were used, one using the osmotic method and the other using the salt solution method. A detailed review of the conditions for using t...
A study was undertaken on a compacted silt to determine fabric modifications induced by suction and/or stress variations. The link between fabric and hydromechanical behaviour was also investigated. A suction-controlled oedometer, using air overpressure, was developed for this purpose and mercury intrusion porosimetry was employed to determine samp...
Soil structure properties are of great importance in a variety of engineering applications. The behavior of such soil is however rather complex and very few results are available to model their hydro- mechanical properties. Some recent laboratory results are presented in this paper. They concern the hydro- mechanical response of soil consisting of...
This paper presents a study performed on a compacted swelling material in the range of suctions comprised between 8.5 and 287.9 MPa. Two series of tests were carried out with suction controlled oedometers. The aim of the first series was to study the compressibility as a function of suction. It showed that the apparent preconsolidation pressure and...
This paper presents a study performed on a compacted swelling material
in the range of suctions comprised between 8.5 and 287.9 MPa. Two series
of tests were carried out with suction controlled oedometers. The aim of
the first series was to study the compressibility as a function of
suction. It showed that the apparent preconsolidation pressure and...
Les sols gonflants compactés sont utilisés dans de nombreuses applications, notamment en géotechnique et en géotechnique de l'environnement. Ces matériaux subissent d'importantes variations de volume en fonction de leur état hydrique, i.e. de leur succion. L'objectif principal du travail présenté ici est d'étudier l'influence de ce paramètre sur le...
